Carburetor



-May ]10, 1932. MENKHAU'S' 1,858,166

CARBURETOR Filed May 22, 1931 WdATTORNEV Patented May 10, 1932 UNITED STATES PATENT; oFFlcF.

Application filed May 22,

This invention relates to carburetors for internal combustion engines of motor vehicles and has for the primary object, the provision of a device of the above stated character which is equipped with means for introducing into the mixing chamber a larger amount of fuel and to heat the latter when desiring to start the engine so that starting of the latter be made comparatively easy in cold weather and which will be discontinued after the starting of the-engine or when the latter reaches its proper temperature for eflicient operation.

Another object of this inv ntion is the provision of a carburetor of he above stated character which will be simple, durable and efiicient and which may be manufactured and a sold at a comparatively low cost.

With these and otherobjects in view, this invention consists in certain novel features of construction, combination and arrangement of parts to be hereinafter more fully described and claimed.

For a complete understanding of my invention, reference is to be had to the following description and accompanying drawings, in which Figure 1 is a top plan view illustrating a carburetor constructed in accordance with my invention.

Figure 2. is a sectional view taken on the line 22 of Figure 1. V

Figure 3 is a detail sectional view, showing the main air inlet to the mixing chamber of the carburetor.

Referring in detail to the drawings, the numeral 1 indicates the base or body of a carburetor having formed therein a mixing chamber 2 and a fuel chamber 3 communicative with the mixing chamber 2 by means which will be hereinafter more fully described. r

The fuel chamber 3 is provided with an inlet port 4 in which is received a fuel supply pipe 5 having a strainer 6 located therein.

1931. Serial No. 539,352.

The intake port4 is constructed to form a 7 valve seat to be engaged by a float actuated I valve 7 for regulating the amount of fuel Within the chamber 3. The fuel chamber 3 is closed by a removable plate 8 formed integral with the neck 9 disposed in alignment and in communication with the mixing chamber 2 and has formed on its end an apertured flange 10 for attachment to the usual intake manifold of an internal combustion engine. A control valve 11 is mounted for pivotal movement in the neck adjacent the flange 10 for the purpose of controlling the passage of fuel from the mixing chamber tothe intake manifold of the engine. and has secured thereto an arm 12 to which an operating means 13 is secured whereby the position of the valve within the neck may be varied.

An air intake pipe 14 is formed integral with the body 1 and is in communication a with the mixing chamber 2 and has its other end connected to a flexible pipe 15 in communication with a stove 16 mounted on the exhaust pipe or manifold 17' of the engine. The stove 16 is in the form of a perforated haust pipe by its end walls and has a neck 18 extending into the flexible pipe 15 so that thesuction of the engine through the carburetor will draw air through the perforated sleeve and into the mixing chamber by way of the pipes 15'and 14.

A control valve 19 is journalled in the pipe .14 and carries an arm 20 to which an operating means 21 is attached for the purpose of sleeve supported in engagement with the ex- 1 the influence of a spring 25 mounted on the stem 26 of said valve and interposed between the upper end of the sleeve 23 and the collar 27 secured to the stem, whereby the valve is normally held in a seated position to prevent fuel from the passage 22 from entering the mixing chamber. The upper portion of the stem 26 is slidably mounted in a suitable guide 26 4 and is engaged by a pivotally mounted lever 27, the other end riding against an arcuately curved extension 30 formed on the arm 20 of the valve 19, so that when the valve 19 is positioned to retard the flow of air into the mixing chamber, for the purpose of starting the engine, the lever 29 will be rocked on its pivot unseating the valve 24 allowing an additional supply of fuel to be introduced into the mixing chamber other than that obtained in the mixing chamber under normal running conditions and which will be hereinafter more fully described.

When disposed in a fully opened position, the spring 25 returns the valve 24 to a seated position closing the passage of fuel from the sleeve 3 to the mixing, chamber.

Between the mixing chamber 2 and the fuel chamber 3 are compartments 31 and 32. The compartment 31 is adapted to receive fuel from the chamber 3 by way of a tapered port controlled by a needle valve 33 threaded to the cover plate 8 whereby the position of the valve 33 relative to the port may be varied to increase and decrease the flow of fuel to the chamber 31. The chamber 31 is in communication with a nozzle 34 located in the mixing chamber 2 by a passage 35 formed in the body 1. The chamber 32 is in communication with a passage 35 by a tapering port controlled by a needle valve 36 similar to the valve 33 whereby the flow of fuel into the chamber 32 may be regulated. The cham ber 32 is in communication with the atmosphere by a vent 37 which is located above the surface of the fuel wi thin the chamber 32 and fuel chamber 33. The lower end of the chamber 32 communicates with a passage 38 that extends upwardly through the neck 9 and into communication with the interior of said neck above the control valve 11 and has located therein a needle valve 39. Thus it will I be seen that fuel mixed with air may be inthe heated air and drawn into the engine by way of the neck 9. The needle valve 33 permits the fuel going to the nozzle 34 to be regulated.

A heating coil 40 is mounted in the neck 9 below the valve 11 and is connected to the electrical source of the automobile and is provided with a suitable switch (not shown) and preferably located in convenient reach 'of the operator of the vehicle so that the coil can be rendered operative and inoperative, when desired.

The fuel chamber 3 is provided with a drain valve 41 whereby settlement within the fuel chamber can be easily removed when necessary.

When desiring to start the engine to which the carburetor is applied, the electrical coil 40 is placed in circuit with the electrical source for a short period of time and the operator pulls upon the operating means 21 to close the valve 19 which opens the valve 25 allowing an additional amount of fuel to enter the mixing chamber when the engine is cranked. The heat from the coil 40 quickly vaporizes the fuel within the mixing chamber 2 so that when the fuel is drawn into the engine it will quickly ignite.

A sleeve 42 is formed on the body 1 and extends upwardly in the mixing chamber 2 about the nozzle 34 and sleeve 23 and terminates in the lower end of the neck 9 and is spaced from the wall of the mixing chamber so that the heated air through the pipe 14 will pass upwardly between the sleeve and the wall of the chamber 2 into the neck while the fuel passes upwardly in the neck from the interior of the sleeve. After the engine is started and operating under normal temperature, the circuit to the coil 40 is broken and when the engine is started the operator gradually opens the valve 19 through the operating means 21 and admits air to the mixing chamber and at the same time closing the additional amount of fuel to the mixing chamber by means of the passage 22.

While I have shown and described the pre ferred embodiment of my invention, it will be understood that minor changes in construction, combination and arrangement of parts may be made without departing from the spirit and scope of my inventlon, as claimed.

Having thus described my invention, what I claim is:

A carburetor comprising a body, mixing and fuel chambers in said body, a nozzle in the mixing chamber, means for regulating fuel from the fuel chamber to said nozzle, a sleeve extending into said mixing chamber and having a valve seat, a spring pressed valve normally engaging the seat, said body having a passage between the sleeve and the fuel chamber, a stem on the valve, an air in take pipe in communication with the mixing chamber, a control valve in said air intake pipe, a neck on the body and in communication with the mixing chamber and connected to the air intake manifold of the engine, a

lever pivotally mounted on the neck and engafing the stem, an operating arm for said va. ve, an arcuate shaped portion on said arm to engage the lever for unaeating the 5 second mentioned valve when the first named valve is moved into a position to close the air pipe, a heatin medium manually controlled and locate in the neck, and a control valve ,in the neck.

10 In testimony whereof I aflix my signature.

RALPH MENKHAUS. 

